NodeTime (type)

{
  "additionalProperties": false, 
  "description": "Node system time in UTC", 
  "id": "NodeTime", 
  "properties": {
    "system_datetime": {
      "$ref": "DatetimeUTC, 
      "required": true, 
      "title": "Datetime string in UTC"
    }
  }, 
  "title": "Node system time in UTC", 
  "type": "object"
}